Research in psychology and economics rarely interacts. A notable exception is Amos Tversky and Daniel Kahneman's research on decision making. The gist of their program is that humans systematically violate norms that have been equated with rationality. These so-called cognitive illusions cast doubt on the rationality assumption of economic models of human behavior. Economists have questioned the validity of these results by criticizing the experimental methods used in psychology. Unlike many psychologists, experimental economists seriously attempt to motivate their participants, provide them with the opportunity to learn, and avoid deceiving them. There are good reasons why psychologists ought to consider those methodological preferences.